Abstract
The problems faced by subway stations in the construction process are more complex than those by overground buildings. Therefore, the construction risk for such structures is highly unpredictable and the risk management is difficult. Building information modeling (BIM) technology has strong visualization, simulation, and integration characteristics that make it conducive to the development of a risk early warning system for underground engineering. According to the functional requirements of risk early warning for subway stations, a risk early warning system based on a BIM real-time construction model is designed in this study for a subway station construction. The operation process of the risk early warning system is established through the grey prediction method to propose the operation method of the early warning system. The early warning system is applied to the Xiangjiang New Town Station of Changsha Metro Line 4 in China to verify its feasibility.
Highlights
Subway construction is currently developing at high speed, and its large construction scale and high development speed will continue for a long time in the future
On the basis of their approach, the present study proposes a method to create a Building information modeling (BIM) real-time model based on 3D laser scanning and the BIM planning model. e creation process is shown in Figure 2. e 3D coordinate points on the site acquired using a 3D laser scanner are calculated to match the planning model, which has two gradual calculation processes: coarse registration and fine registration. e collected point clouds are identified quickly to generate the component model. e BIM planning model contains component-related parameter information. erefore, only the location and direction of the model components must be adjusted according to the identified components to automatically transform the planning model to the real-time model
Starting from the functional requirements of subway station risk warning system, this paper combines BIM with emerging information technology to develop a BIM-based construction real-time risk warning system, which is applied to subway station engineering examples. e main research results are as follows: (1) A real-time construction model creation method based on 3D laser scanning technology is proposed
Summary
Subway construction is currently developing at high speed, and its large construction scale and high development speed will continue for a long time in the future. By combining 3D laser scanning technology, the acquisition of site data information and the method of information matching and identification are studied, proposing a real-time construction model based on the BIM planning model. Rough the above steps, the point cloud data collected by the scanner are preliminarily registered with the BIM planning model, and the actual construction status of components of the scanned building (or structure) is expressed. Similar to point cloud registration, fine registration is made for components by using the ICP algorithm to determine the direction and position of components At this point, every component object in the BIM planning model can obtain the point cloud of the component state with complete and real-time information, supporting the planning model to update component information according to the actual construction state to generate the real-time construction model
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